The effects of rumen ciliate protozoa on energy metabolism and some constituents in rumen fluid and blood plasma of goats

Itabashi, H.; Kobayashi, T.; Matsumoto, M.

Japanese Journal of Zootechnical Science 55(4): 248-256


DOI: 10.2508/chikusan.55.248
Accession: 001266447

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Three faunated and 3 unfaunated goats were given 3 different diets and energy metabolism was compared between the 2 groups. The effect of monensin was also studied. The goats were fed hay only in experiment 1, hay-concentrate in experiment 2 and hay-concentrate containing monensin in experiment 3. The concentration of rumen NH-N in the faunated group was higher than that in the unfaunated group in all 3 experiments, the difference being significant in experiment 2. The molar proportion of propionic acid in the rumen of the faunated group tended to be less than in the unfaunated group while that of butyric acid tended to be greater. Monensin reduced protozoal number in the faunated group and increased the proportion of propionic acid in both groups. The groups did not differ significantly in energy metaoblism in experiment 1. Methane energy was significantly higher in the faunated goats in experiment 2. In all the experiments, urinary energy tended to be greater, fecal energy to be less and retained energy to be greater in the faunated goats. The digestibility of feed N tended to be greater in the faunated group. The groups differed only slightly in N retention; urine N tended to be greater in the faunated goats. Monensin reduced the methane and fecal energy and increased urinary N. The concentration of plasma glucose tended to be higher in the faunated group in experiments 2 and 3. The groups did not differ in plasma urea-N. Monensin tended to increase these concentrations in both groups.